Mixing pump

ABSTRACT

A mixing pump is disclosed in which a primary liquid under pressure actuates a diaphragm which in turn actuates a pump piston to pump and measure a fixed volume of a secondary liquid and deliver it to mix with the discharge of the primary liquid. A control valve and valve activating mechanism are provided actuated by movement of a tubular rod connecting the diaphragm and the pump piston.

United States Patent Goodhart 1111 3,853,431 ['45] Dec. 10, 1974 3,589,839 6/1971 Johnson 4l7/39l Primary ExaminerCarlton R. Croyle Assistant ExaminerRichard E. Gluck Attorney, Agent, or Firm-2nd Wobensmith; Zachary T. Wabensmith, Ill

1571 ABSTRACT A mixing pump is disclosed in which a primary liquid 1 under pressure actuates a diaphragm which in turn actuates a pump piston to pump and measure a fixed volume of a secondary liquid and deliver it to mix with the discharge of the primary liquid. A control valve and valve activating mechanism are provided actuated by movement of a tubular rod connecting the diaphragm and the pump piston. v

8 Claims, 7 Drawing Figures I MIXING PUMP BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a mixing pump for mixing measured quantities of two liquids and which is actuated by the pressure of one of the liquids.

2. Description of the Prior Art v It has heretofore been proposed to provide mixing pumps for delivery of a liquid containing a plurality of liquid components in measured quantities.

Typical illustrations are shown in the US. Pat. Nos. to Clack 3,205,830; Anderson 3,288,071 Jorgensen, et al., 3,414,186; Orlita, 3,601,508, and Drake, 3,612,727.

The pumps heretofore available had various shortcomings including high cost of construction, and operating difficulties under prolonged use.

SUMMARY OF THE INVENTION In accordance with the invention a diaphragm type mixing pump is provided operated by a liquid under pressure which forms one of the components of the delivered liquid, the diaphragm driving a pump piston for the other liquid and being controlled by a valve which is reversed at each end of the pump piston stroke by valve operating mechanism.

It is the principal object of the invention to provide a positive displacement mixing pump operated by a liquid under pressure forming one component of the mixture and which will maintain the proportions of the main stream liquid and of the secondary liquid with changes of pressure and/or flow rate.

It is a further object of the invention to provide a mixing pump which is simple in construction, can be readily constructed of materials in contact with the liquids which are not subject to corrosion or the like by the liquids.

It is a further object of the invention to provide a mixing pump in which the liquids to be mixed are brought together'at the outlet.

Other objects and advantageous features of the invention will be apparent from the description 7 and claims.

BRIEF DESCRIPTION OF THE DRAWINGS The nature and characteristic features of the invention will be more readily understood from the following description taken in connection with the accompanying drawings forming part hereof, in which:

FIG. 1 is a vertical central sectional view of the mixing pump of the invention;

FIG. 2 is a fragmentary vertical sectional view approximately on the line 2-2 of FIG. 1;

FIG. 3 is a fragmentary horizontal sectional view taken approximately on the line 3-3 of FIG. 1;

FIG. 4 is a fragmentary vertical sectional view taken approximately on the line 4-4 of FIG. 1;

FIG. 5 is a fragmentary vertical sectional view taken approximately on the line 55 of FIG. 1;

FIG. 6 is a diagrammatic view showing the pump in one operating condition; and

FIG. 7 is a view similar to FIG. 6 showing the pump in another operating condition.

It should, of course, be understood that the description and drawings herein are illustrative merely and taken that various modifications and changes can be made in the structure disclosed without departing form the spirit of the invention.

Like numerals refer to like parts throughout the several views.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now more particularly to the drawings a body 10 is provided having secured thereto diaphragm housing plates 11 and 12, and separated by a diaphragm mounting ring 13 which carries the periphery of a flexible diaphragm 14. Discs l5 and 16 of smaller diameter than the diaphragmv 14 are engaged with opposite side faces of the diaphragm l4 and carry a tube 18, held in place by nuts 19 and 20 threaded thereon which serves as a piston actuator.

The diaphragm 14, between the housing plates 11 and 12, and within the ring 13, separates upper and lower diaphragm chambers 22 and 23, the interior of the tube 18 being incontinuous communication with the chamber 23.

The body 10 has a vertical bore 25 and intermediate the ends has an inwardly extending chamber 26 for the reception of operating elements hereinafter described.

The tube 18 extends upwardly from the chamber 22 in the bore 25. A closure 28 through which the tube 18 extends is held in place by an expansible split ring 29 in a recess 30 and by a shoulder 31, and can have a packing 32 for preventing fluid leakage between the closure 28 and the plate 11, and a packing 33 for preventing fluid leakage between the tube 18 and the closure 28. 4

An upper closure 35 is provided through which the tube 18 extends, the closure 35 being held in place by expansible split rings 36 and 37 in recesses 38 and 39. A packing 40 can be provided for preventing fluid leakage between the closure 35 and the bore 25 and a packing 41 can be provided for preventing fluid leakage between the tube 18 and the closure 35.

The bore 25, above the closure 35, has a fluid connection 43 in communication therewith for the supply and delivery of liquid through ports 44 in the tube 18.

The tube 18, on the upper end thereof, has a piston 45 secured thereto and movable therewith. A packing 46 can be provided to prevent fluid leakage between the piston 45 and the bore 25. The upper end of the bore 25 provides a pump chamber 47 with which a supply connection 48 for the supply of the secondary fluid is in communication through a normally open inlet check valve 49 which moves upwardly to a closed position upon upward movement of the piston 45. The secondary fluid can be any desired material such as a sterilizing or treating chemical to be added for a swimming pool, a chemical additive such as a fertilizer, a softener or a nutrient to be added to water, or chemicals, cleaners and the like to be added in measured quantities. While a measured quantity is delivered witheach stroke, the quantity of a specific material to be added may be controlled by controlling the concentration of the chemical in the liquid supplied the pipe 48.

A delivery connection 50,'havingfa discharge check valve 51 therein, extends from the chamber 47 to the mixed fluid delivery pipe 53.

The check valve 51 is closed on the downward or intake stroke of the piston 45 but opens on the up stroke of piston 45 for delivery of the secondary fluid to the pipe 53.

A primary liquid supply pipe 55 is provided connected to a suitable source of liquid under pressure. The primary liquid can be any desired liquid although for many uses water will be utilized.

The supply pipe 55 is in communication with a fluid connection 56 which extends to one side of a valve bore 58. A fluid connection 59 is tapped off from the fluid connection 56 and leads to a chamber 60 in which a resiliently acting piston 61 is movable, urged to the left, and in aid of the pressure supplied the fluid connection 56 by a spring 62. A packing 63 prevents fluid leakage between the piston 61 and the chamber 60.

' From the bottom of the valve bore 58 a fluid connection 65 leads to the chamber 22, and the fluid connection 43 extends to the top of the valve bore 58. A fluid connection 66 connects the other side of the valve bore 58 to the mixed fluid delivery pipe 53, the secondary fluid delivery connection 50 also being connected to the fluid connection 66.

A valve plug 68 carried in the bore 58 has passageways 69 and 70 therein for connecting the fluid connection 56 to the fluid connection 65 and the fluid connection 43 to the fluid connection 66 in one position, and for connecting the fluid connection'56 to the fluid connection 43 and the fluid connection 65 to the fluid connection 66 in the other position.

The valve plug 68 can be positioned alternately to each of its two positions in any desired manner. It is preferred, however, to provide the valve plug 68 with an actuating crank, 72.

The tube 18, at spaced locations, has operating lugs 73 and 74 secured thereto for alternate engagement with a pin 75 which is a pivot pin carried on a plate 76. The plate 76 is pivotally mounted on a pin 77 carried on a supporting frame 78 mounted on the body 10. The pivot pin 75 has an arm 79 pivotally carried thereby which at its other end is carried on a pivot pin 80 in the piston 61.

The plate 76 also has upper and lower actuating fingers 82 and 83 for respective engagement with the crank 72. The upper finger 82 turns the crank 72 downwardly to position the valve plug 68 to initiate upward movement of the diaphragm 14 and of the piston 45 at the lower end of their stroke and the lower finger 83 turns crank 72 upwardly to position the valve plug 68 to initiate downward movement of the diaphragm 14 and piston 45 at the upper end of their stroke.

It will be noted that the plate 76, arm 79, resilient end support of the arm 79 by the piston 61 provide a toggle type snap action effective in each direction and that the shifting of the valve plug 68 is delayed until close to each end of the stroke and then the valve plug 68 is moved.

The mode of operation will now be pointed out.

The primary liquid under pressure is supplied through the pipe 55 to the fluid connection 56.

The secondary liquid is supplied through the pipe 48 for delivery into the chamber 47.

If the fluid connection 56 is connected by the port 70 of the valve plug 58 to the fluid connection 65, (see FIG. 6) fluid under pressure will be effective in the chamber 22 on the diaphragm 14 to urge it downwardly and fluid therebelow in the chamber 23 will be forced upwardly through the tube 18, through the ports 44, and the fluid connection 43, the passageway 69 in the valve plug 68, the fluid connection 66 and the delivery pipe 53.

During downward movement of the piston 45 in the chamber 47 secondary fluid is drawn in past the check valve 49 but the check valve 51 will close.

When the bottom of the stroke is reached, the upper lug 73, through the pin 75, plate 76, arm 79 and finger 82 will through the crank 72 shift the valve plug 68 to reverse the direction of fluid force application to urge the diaphragm l4 and piston 45 upwardly (see FIG. 7). The valve plug 68 will be now be positioned to supply liquid under pressure from the fluid connection 56 through the port 69, the fluid connection 43, the ports 44 and the tube 18 to the chamber 23 to urge the diaphragm l4 and the piston 45 upwardly. Liquid in the chamber 22 moves through the fluid connection 65, ports and fluid connection 66 to the pipe 53 for delivery.

Upward movement of the piston 45 is effective for delivering the secondary liquid previously drawn into the chamber 47 past the check valve 51 and through the fluid connection 50 for mixing with the primary liquid.

When the piston 45 is close to he top of its stroke, the valve plug 68 is then moved to the position shown in FIG. 6 to move the diaphragm l4 downwardly as previously explained.

The operation will continue so long as the primary fluid is supplied for actuation and delivery, and the secondary liquid is also supplied.

It will thus be seen that apparatus has been provided with which the objects of the invention are attained.

I claim:

. 1. A mixing pump a body,

a supply connection to a primary fluid under pressure connected to said body,

a supply connection to a secondary fluid connected to said body,

a delivery connection,

a pressure fluid responsive diaphragm carried by said body,

a secondary fluid pump piston in said body and having a predetermined stroke,

an operating member comprising a tube between said diaphragm and said pump piston and in communication with one side of the diaphragm for supply of fluid to and delivery of fluid thereform for moving said piston upon movement of said diaphragm,

a valve member controlling the supply of primary fluid alternately against each side of said dia phragm and delivery of primary fluid from the opposite side of said diaphragm to said delivery connection, v

valve operating mechanism controlled by the positioning of said operating member for shifting said valve member, 7

said body having a chamber in which said piston is movable, 1

said chamber having said secondary fluid supply connection connected thereto through a non-return valve and being connected to said delivery connection through a non-return valve.

2. A mixing pump as defined in claim 1 in which for fluids comprising said valve member includes an oscillatable rotary plug.

3. A mixing pump as defined in claim 2 in which said plug has an actuator crank carried thereby, and

said crank is part of said valve operating mechanism.

4. A mixing pump as defined in claim 1 in which said tube has spaced operating lugs thereon comprising part of said valve operating mechanism.

5. A mixing pump as defined in claim 4 in which said valve operating mechanism further comprises,

pivotally connected toggle members having a resilient member effective thereon for snap action of said toggle members in each direction,

a crank connected to said valve member for positioning said valve member,

said lugs at opposite ends of their movement controlling the positioning of said valve members through said toggle members and said crank.

6. A mixing pump as defined in claim 4 in which said valve operating mechanism comprises pivotally connected snap action toggle members with a fixed pivot at one end and a resiliently uged pivot at the other end.

7. A mixing pump as defined in claim 6 in which a member responsive to the pressure of the primary liquid supply is connected to said resiliently urged piovt.

8. A mixing pump as defined in which one of said toggle members is a plate and has spaced fingers thereon for valve actuation. 

1. A mixing pump for fluids comprising a Body, a supply connection to a primary fluid under pressure connected to said body, a supply connection to a secondary fluid connected to said body, a delivery connection, a pressure fluid responsive diaphragm carried by said body, a secondary fluid pump piston in said body and having a predetermined stroke, an operating member comprising a tube between said diaphragm and said pump piston and in communication with one side of the diaphragm for supply of fluid to and delivery of fluid thereform for moving said piston upon movement of said diaphragm, a valve member controlling the supply of primary fluid alternately against each side of said diaphragm and delivery of primary fluid from the opposite side of said diaphragm to said delivery connection, valve operating mechanism controlled by the positioning of said operating member for shifting said valve member, said body having a chamber in which said piston is movable, said chamber having said secondary fluid supply connection connected thereto through a non-return valve and being connected to said delivery connection through a non-return valve.
 2. A mixing pump as defined in claim 1 in which said valve member includes an oscillatable rotary plug.
 3. A mixing pump as defined in claim 2 in which said plug has an actuator crank carried thereby, and said crank is part of said valve operating mechanism.
 4. A mixing pump as defined in claim 1 in which said tube has spaced operating lugs thereon comprising part of said valve operating mechanism.
 5. A mixing pump as defined in claim 4 in which said valve operating mechanism further comprises, pivotally connected toggle members having a resilient member effective thereon for snap action of said toggle members in each direction, a crank connected to said valve member for positioning said valve member, said lugs at opposite ends of their movement controlling the positioning of said valve members through said toggle members and said crank.
 6. A mixing pump as defined in claim 4 in which said valve operating mechanism comprises pivotally connected snap action toggle members with a fixed pivot at one end and a resiliently uged pivot at the other end.
 7. A mixing pump as defined in claim 6 in which a member responsive to the pressure of the primary liquid supply is connected to said resiliently urged piovt.
 8. A mixing pump as defined in which one of said toggle members is a plate and has spaced fingers thereon for valve actuation. 